Bolt anchor



H. w. PLEISTER] BOLT ANCHOR.

APPLICATION FILED SEPT. 23. 1921.

1,429,299, A PatentedSept. 19, 1922.

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Patented Sept. 19, 1922.

HENRY w. IPLEISTER, or wEs'rrInLD, NEWHALL.

assrenon TO HENRY B;

NEW JERSEY,

BOLT ANCHOR.

Application filed September 23, l921. $eria1 No. 502,766.

T all whom it may concern Be it known that I, HENRY W. PLEISTER; a citizen of the United States, residing at W estfield, in the county of Union and State of New Jersey, have made certain new and useful Improvements in Bolt Anchors, of which the following is a specification, taken in connection with the accompanying drawings.

expansion bolts, and more particularly to what is known in the trade as machinezexpensions.

My invention relates more particularly to forming the shell or shells of the expansion from rolled pressed steel of minimum thickness for the particular size expansion.

My invention further relates tousing this pressed steel shell or shells in combination with the ordinary malleable iron nut and collar, or preferably in combination with a steel nut, or steel collar, or both, my invention comprising any combination of these different elements as set forth in the claims.

My invention further relates to certain combinations, sub-combinations, articles of manufacture, and details of constructions all of which will be more fully} hereinafter describedand pointed out in the claims.

In the drawingsl .have shown different embodiments of my invention but it is of course .to be understood that my invention is not to be confined to the embodiments shown by way of illustration v Fig; 1- is a vertical section showing my pressed steel shell used in combination with a malleable iron collar and malleable iron nut; a I

Fig. 2 is a view similar to Fig. 1 but 40 showing the parts after they have been expanded within the wall or other suitable S pp Fig. 's a vertical section on the line 33 of-Fig'. 1; f

Fig. fl is a vertical section on theline H F g-hm.

Fig. 5 is a plan view of the blank; i

Fig. 6 is a cross-section of the blank on the line 6 -6 of Fig. 5; v

Fig. 7 is a perspective view of one offthe units after being bent or shapedto form a substantially semi-circular shell;

Fig. 8 is a perspective view of themalleable iron collar used in Fig. 1;,

Fig. 9 is a vertical section throu'glra modi- My invention relates :to bolt anchors or quired expansion.-

fied and preferred form of collar formed from steel tubing one end of which has been expanded; i

Fig. 10 is a vertical section through a modifiedform of steel nut formed from tubing one end of which has been expanded;

Fig. 11 is a perspective view of a spring ring which I may employ to hold the shells together; I

Fig 12. is a fragmentary detail viewof a modified form of construction in which the end of the lugs are upset so as to secure the shells to the collar and'nut;

Fig. 13 is a vertical detail section, similar to Fig. 12, showing the lugs of the pressed steel collar and nut upset for. the same purpose. w

Expansion bolts and more particularly machine expansion bolts are now commonly made from castings of malleable iron. There are many objections, however, in manufacturing them inthis manner. The cost is relatively high for there arelimits in the thinness of the walls that can be cast from malleable iron so that the resulting casting is heavier than necessary in places where thickness is not required. Moreover in the ordinary manufacture of machine expansions formed of malleable iron castings, there is a large waste from warping of, the castings, mis-runs, too thin castings, sand holes, blow-holes, rough surfaces, fins, and other deformatives. Also considerable grinding has to be done in removing sprews from the malleable iron castings, all of which add greatly to the expense of manufacture. By my invention I avoid all this waste and .expense,obviate grinding and rejections or discards by forming a finisheduniform ,product which canbe turned out. from the .95 press without any further work except in connection with the pressed steel nuts, when used, vvhich have to-be screw-threaded. The resulting productyby my method takes only the minimum amount of. metalfor the Ire- 1. 00

. In the embodiment of my invention shown in the drawings, 1 is a blank of pressed sheet steel of the required minimum thickness for thexpartic ular expansion to be manufactured. This blank is provided in anysuitable manner, as for example by rolling, with bevel edges 2, 2 and is of a width to correspond with the length ofthe shell of theexpan .sion to be manufactured. This blank is fed through a punch press which divides the blank into units 8, 8 on the line 3, 3, preferably also punching out the V-SllELPGd slots 4;, 4 between each unit. 1 At the same time I preferably punch the elongated slots 5 and 6 on the central axis of each unit. I also preferably, though not necessarily, punch at the same time a hole 7 in each unit.

The units 8, 8 are then fed into a forming die which will roll them or shape them into semi-cylindrical shells 9, 9, Fig. 7. In the form of my invention illustrated two of these shells 9 are employed, and preferably, though not necessarily, secured together by means of the spring ring 10, F 11. This ring is provided with a crimp 11 and its ends are provided with fingers l2, 12. In positioning the ring the crimp 11 will be positioned in one hole 7 in one shell 9 and the fingers 12, 12 will be positioned in the corresponding hole 7 in the other shell 9, as shown more clearly in F 1.

The bevel surfaces 2, 2 form the inclined surfaces 2, 2 of the shell 9 so that each shellis thicker intermediate its length than it is at its ends.

I may use any suitable means to expand the shells 9, 9. For example, as shown in Figs. 1 and 2, I may employ a malleable iron collar 13 and a malleable iron nut 1%. The malleable iron collar 13 is provided with lugs 15, 15 which are received in, and cooperate with, the elongated slots 6, 6 in the shells 9, 9. The lugs 15, 15, Figs. 1 and 2, on the malleable iron nut 14- are received in and cooperate with the elongated slots 5, 5 in the shells 9, 9.

In positioning the work 16, the bolt 17 is passed through the work, the unthreaded malleable iron collar18 and through the malleable iron nut 14, which is provided with screw-threads to cooperate with those on the bolt 17 By turning the ,head 18 of the bolt the shells 9, 9 are caused to expand in parallel relation to each other, as shown in Fig. 2. i

In this form of my invention I use pressed steel shells 9, 9 with a malleable iron collar and a malleable iron nut. Preferably, however, I use a pressed steel collar and a pressed steel nut with my pressed steel shells 9. I have shown in Fig. 9 a pressed steel collar 19 formed of tubing of the required diameter'it'or the particular size expansion, one end being expanded in any suitable manner, to form a frustum of a cone 20. Preferably, I cut the unexpanded portion 21 and bend out the cut metal to form the lugs 22, 22.

My present steel nut 23, Fig. 10, is likewise providedwith an unexpanded portion 24 and an expanded portion 25 forming a frustum ot a cone. The unexpanded portion is cut and provided with lugs 26, 26. Unlike the collar 19, the nut is provided with screw-threads 27, to cooperate with the threads upon the bolt 17. I may use with the pressed steel shells 9, 9 both the pressed steel collar and nut 19 and or I may substitute for either or both the collar and nut, one of malleable iron collars or malleable iron nuts.

In some cases I dispense with the ring 10. I may for example, as shown in Fig.

12 upset the lugs 15, 15 forming upon them P heads 28 sufiiciently large to prevent the disengagement of the shells 9, 9, it being understood that the lugs on the malleable iron nut are upset in the same manner.

In Fig. 13 I have shown the lugs 22 upset for the same purpose of preventing the disengagement oi the parts one from the other without-the aid of the spring ring 19.

Having thus described this invention in connection with. illustrative embodiments thereof, to the details of which I do not desire to be limited, what is claimed as new and what is desired to secure by Let ters Patent is set forth in the appended claims. I

What I claim is 1. The combination in an expansion bolt of expansible shells, a collar, a nut, and cooperating means between the shells, collar and nut and integral with the collar and nut to secure them together.

2. The combination in an expansion bolt of expansible shells provided with slots, a collar and a nut, lugs on the collar and nut cooperating with the slots in the shells, and integral means on the lugs to prevent the disengagement of the parts.

3. The combination in an expansion bolt of expansible. shells provided with slots. a collar and a nut, lugs on the collar and nut cooperating with the slots in the shells, the ends of the lugs being upset to prevent disengagement of the parts.

4. The combination in an expansion bolt of a pluralityof pressed steel shells having inclined surfaces at each end, and elongated slots, an expanded steel collar and an expanded steel nut, the collar and nut being provided with lugs to cooperate with the elongated slots in the steel shells.

5. The combination in an expansion bolt of a plurality of pressed steel shells having inclined surfaces at each end, and elongated slots, an expanded steel, collar and an expanded steel nut, the collar and nut being provided with. lugs to cooperate with the elongated slots in the steel shells the ends of the lugs being upset to prevent disengagement of the shells from the collar and nut. I

, HENRY W; PLEISTER.

Witnesses: I I

MARY R. RYAN, ELIZABETH J. ROTH. 

